The young couple would be moving to Las Vegas. For her, it was the last day of work at San Francisco International Airport. For him, it was a matter of picking her up and heading home to pack.

But as Mark Mangaccat backed into their Daly City driveway last week to begin packing, prosecutors said, a man approached and fired five to six shots into the car. Mangaccat died on the scene, but for some reason his girlfriend — the mother of their 3-year-old child — was left unharmed.

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It now appears the suspected shooter in the April 25 slaying was an obsessed suitor.

Kevin B. Prasad, a 31-year-old airport security guard for Covenant Aviation Security, could face the death penalty for the shooting, according to San Mateo County prosecutors, who accused him of seeking out a relationship with the victim’s girlfriend, asking her to dump her boyfriend and then killing Mangaccat when he couldn’t get his way.

Prasad, Mangaccat, and Mangaccat’s girlfriend, identified by CBS San Francisco as Thandel Seinn, met in 2014. All three worked at the airport, said Tricia Povah, a San Mateo County deputy district attorney.

“We were friends. At the airport we work in same job; [my] boyfriend, me and him, we were friends,” said Seinn.

Seinn said Prasad had asked her out before, but she never took him seriously.

“He just tell me, ‘Don’t go’ and ‘I want to be with you,'” said Seinn, “He would just say something like a friendly joke.”

She said Prasad never made her nervous. She's now heartbroken by the loss of the man she said was her "soulmate."

Though the suspected shooter most recently worked for Covenant, a federal contractor tasked with screening passengers and baggage at San Francisco’s airport, it’s not clear if any of the three worked for the company at that time. Mangaccat had been out on medical leave from an unspecified position at the airport since December 2017, prosecutors said.

The day Mangaccat died, prosecutors said, Prasad and Donovan Matthew Rivera, a 25-year-old Hayward resident, followed the couple to their home. Rivera allegedly acted as the getaway driver while Prasad was identified as the gunman.